TLOG

Tile Operation Diagram

Introduction

Elementwise natural logarithm of a tile.

Math Interpretation

For each element (i, j) in the valid region:

$${\mathrm{d}\mathrm{s}\mathrm{t}}_{i,j}=\log ({\mathrm{s}\mathrm{r}\mathrm{c}}_{i,j})$$

Assembly Syntax

Synchronous form:

%dst = tlog %src : !pto.tile<...>

AS Level 1 (SSA)

%dst = pto.tlog %src : !pto.tile<...> -> !pto.tile<...>

AS Level 2 (DPS)

pto.tlog ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

C++ Intrinsic

Declared in include/pto/common/pto_instr.hpp:

template <auto PrecisionType = LogAlgorithm::DEFAULT, typename TileDataDst, typename TileDataSrc,
          typename... WaitEvents>
PTO_INST RecordEvent TLOG(TileDataDst &dst, TileDataSrc &src, WaitEvents &... events);

PrecisionType has the following values available:

• LogAlgorithm::DEFAULT: Normal algorithm, faster but with lower precision.
• LogAlgorithm::HIGH_PRECISION: High precision algorithm, but slower.

Constraints

• Implementation checks (NPU):
  • TileData::DType must be one of: float or half;
  • Tile location must be vector (TileData::Loc == TileType::Vec);
  • Static valid bounds: TileData::ValidRow <= TileData::Rows and TileData::ValidCol <= TileData::Cols;
  • Runtime: src.GetValidRow() == dst.GetValidRow() and src.GetValidCol() == dst.GetValidCol();
  • Tile layout must be row-major (TileData::isRowMajor).
• Valid region:
  • The op uses dst.GetValidRow() / dst.GetValidCol() as the iteration domain.
• Domain / NaN:
  • Domain behavior (e.g., log(<=0)) is target-defined.
• High Precision Algorithm
  • Only available on A5, PrecisionType option is ignored on A3.

Examples

#include <pto/pto-inst.hpp>

using namespace pto;

void example() {
  using TileT = Tile<TileType::Vec, float, 16, 16>;
  TileT x, out;
  TLOG(out, x);
  TLOG<LogAlgorithm::HIGH_PRECISION>(out, x);  // A5 Only
}

ASM Form Examples

Auto Mode

# Auto mode: compiler/runtime-managed placement and scheduling.
%dst = pto.tlog %src : !pto.tile<...> -> !pto.tile<...>

Manual Mode

# Manual mode: resources must be bound explicitly before issuing the instruction.
# Optional for tile operands:
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.tlog %src : !pto.tile<...> -> !pto.tile<...>

PTO Assembly Form

%dst = tlog %src : !pto.tile<...>
# AS Level 2 (DPS)
pto.tlog ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)